From Xojo Documentation

Property (As Boolean )
aMessageDialogButton.Visible = newBooleanValue
BooleanValue = aMessageDialogButton.Visible

Supported for all project types and targets.

Set to True to show the button.


Only the ActionButton is shown by default. It has no effect on the ActionButton.


This example uses Visible to display the AlternateActionbutton.

Var d As New MessageDialog //declare the MessageDialog object
Var b As MessageDialogButton //for handling the result
d.Icon = MessageDialog.GraphicCaution //display warning icon

d.ActionButton.Caption = "Save"
d.CancelButton.Visible = True //show the Cancel button
d.AlternateActionButton.Visible = True //show the "Don't Save" button
d.AlternateActionButton.Caption = "Don't Save"
d.AlternateActionButton.Cancel = True // sets AlternateAction button to cancel
d.Title = "This is the Title (Windows & Linux)"
d.Message = "Do you want to save changes to this document before closing?"
d.Explanation = "If you don't save, your changes will be lost. "

b = d.ShowModalWithin(Window1) //display the dialog in the window
Select Case b //determine which button was pressed.
Case d.ActionButton
// user pressed Save
Case d.AlternateActionButton
// user pressed Don't Save
Case d.CancelButton
// user pressed Cancel
End Select